public static String getIPAddress()

in tsfile-viewer-web/src/main/java/org/apache/iotdb/ui/util/IpUtils.java [28:68]
31 lines of code
19 McCabe index (conditional complexity)

  public static String getIPAddress(HttpServletRequest request) {
    String ip = null;

    // X-Forwarded-For：Squid 服务代理
    String ipAddresses = request.getHeader("X-Forwarded-For");
    if (ipAddresses == null
        || ipAddresses.length() == 0
        || "unknown".equalsIgnoreCase(ipAddresses)) {
      // Proxy-Client-IP：apache 服务代理
      ipAddresses = request.getHeader("Proxy-Client-IP");
    }
    if (ipAddresses == null
        || ipAddresses.length() == 0
        || "unknown".equalsIgnoreCase(ipAddresses)) {
      // WL-Proxy-Client-IP：weblogic 服务代理
      ipAddresses = request.getHeader("WL-Proxy-Client-IP");
    }
    if (ipAddresses == null
        || ipAddresses.length() == 0
        || "unknown".equalsIgnoreCase(ipAddresses)) {
      // HTTP_CLIENT_IP：有些代理服务器
      ipAddresses = request.getHeader("HTTP_CLIENT_IP");
    }
    if (ipAddresses == null
        || ipAddresses.length() == 0
        || "unknown".equalsIgnoreCase(ipAddresses)) {
      // X-Real-IP：nginx服务代理
      ipAddresses = request.getHeader("X-Real-IP");
    }

    // 有些网络通过多层代理，那么获取到的ip就会有多个，一般都是通过逗号（,）分割开来，并且第一个ip为客户端的真实IP
    if (ipAddresses != null && ipAddresses.length() != 0) {
      ip = ipAddresses.split(",")[0];
    }

    // 还是不能获取到，最后再通过request.getRemoteAddr();获取
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
      ip = request.getRemoteAddr();
    }
    return ("0:0:0:0:0:0:0:1").equals(ip) ? "127.0.0.1" : ip;
  }